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stmos/README.md

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stmos

stmos is an operating system for STM microprocessors. It aims to support (or be able to support) all STM Cortex-M processors.

Features:

  • Unprivileged code execution
  • ELF loading and execution (loads an init from the initrd)
  • Near-full C standard library support for loaded ELFs
  • libgpio: GPIO access for loaded ELFs

Currently supported processors:

  • STM32L476RG (board: NUCLEO-L476RG)

building

To build stmos, you'll need the following programs:

  • The arm-stmos toolchain (see the arm-stmos folder)
  • openocd
  • gdb (with multiarch support)

To compile stmos simply run make (-j option supported). To upload, use run.sh to start openocd/gdb; do lo to load stmos, and c to run it.

notes

Only the initrd works right now in regards to filesystem access. Files in the folder src/initrd/files are put into the initrd. C source files in src/initrd are compiled with libgpio, placing the program in src/initrd/files.

What's next for stmos?

  • SD card support
  • Display support (ILI....)
  • Script program support (a shell like sash, maybe lua)
  • More ELF work (better execve, signals?, etc.)